Properly close Humanize in UMD wrapper

Closes HubSpot#73

Bump to 1.8.1

Turn on mangling in minification

Merge pull request HubSpot#69 from HubSpot/babel

[1.7.0] Coffeescript -> ES2015

Limit travis node versions for now

Merge pull request HubSpot#54 from HubSpot/docfix

update package.json example and changelog

Merge pull request HubSpot#42 from HubSpot/context

Fixing context bugs via direct assignment. Fixes HubSpot#41.

First version.